This might help you:
http://www.acousticguitar.com/articl...rticleid=25540
Also, see this article/videos by Adam Rafferty:
http://adamrafferty.wordpress.com/20...guitar-videos/
Also, Fran Guidry has a lot of stuff on his homebrewedmusic.com site
Fran's the guy who's gone thru lots of cameras! Basically, at this point, almost any cheap HD camera, even many cell phones are plenty good enough for You Tube. Camera models change constantly, so odds are high that anything anyone else is using is already not made, replaced by a newer model.
Syncing is simple if you have software that lets you line up audio and video tracks. Just clap before you start and line the tracks up. There is even software that will do it automatically for you, no clap required. Lots of details on all of this in the above links.